BlackBerry Curve 8320 Smartphone GSM Wireless Handheld Device w/Camera Bluetooth QWERTY Keyboard 2.4" LCD (Gray) 2G: GSM Quad-Band 850 / 900 / 1800 / 1900 Full Physical QWERTY keyboard + Trackball BlackBerry OS, 32-bit Intel XScale PXA272 312 MHz Processor 2 Megapixel Camera (1600 x 1200 pixels) w/ LED Flash Internal Memory: 64 MB ROM + microSD Slot Expandable up to 4GB Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.